computer with term lib: somewhat works; new cobblestone texture

Former-commit-id: 8a1a21cc1ea874ec1c243cae7b1e920bdab3be4f
Former-commit-id: ee7aeb05896a36960050f0656764ccf477e5f90d

src/net/torvald/terrarum/virtualcomputer/assets/lua/BRAINFUCK.lua

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+--[[
+From  https://github.com/prapin/LuaBrainFuck/blob/master/brainfuck.lua
+
+LuaBrainFuck License
+--------------------
+
+LuaBrainFuck is placed under the same license as Lua itself,
+so licensed under terms of the MIT license reproduced below.
+This means that the library is free software and can be used for both academic
+and commercial purposes at absolutely no cost.
+
+===============================================================================
+
+Copyright (C) 2012 Patrick Rapin, CH-1543 Grandcour
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+===============================================================================
+
+(end of COPYRIGHT)
+
+Example usage: require "brainfuck" "+++>>> your BF code here <<<---"
+ ]]
+return function(s)
+    local subst = {["+"]="v=v+1 ", ["-"]="v=v-1 ", [">"]="i=i+1 ", ["<"]="i=i-1 ",
+        ["."] = "w(v)", [","]="v=r()", ["["]="while v~=0 do ", ["]"]="end "}
+    local env = setmetatable({ i=0, t=setmetatable({},{__index=function() return 0 end}),
+        r=function() return io.read(1):byte() end, w=function(c) io.write(string.char(c)) end },
+        {__index=function(t,k) return t.t[t.i] end, __newindex=function(t,k,v) t.t[t.i]=v end })
+    load(s:gsub("[^%+%-<>%.,%[%]]+",""):gsub(".", subst), "brainfuck", "t", env)()
+end

src/net/torvald/terrarum/virtualcomputer/assets/lua/ROMBASIC.lua

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+-- global variables
+_COMPUTER = {} -- standard console colours
+_COMPUTER["DC1"] = string.char(17) -- black
+_COMPUTER["DC2"] = string.char(18) -- white
+_COMPUTER["DC3"] = string.char(19) -- dim grey
+_COMPUTER["DC4"] = string.char(20) -- light grey
+_COMPUTER["prompt"] = function()
+    io.write(_COMPUTER.DC3 .. "> " .. _COMPUTER.DC4)
+end
+-- greet user
+print("Rom basic " .. _COMPUTER.DC2 .. _VERSION .. _COMPUTER.DC4)
+-- print(_COMPUTER.DC2 .. freemem .. _COMPUTER.DC4 .. " bytes free"
+print("Ok")
+-- prompt start
+--_COMPUTER.prompt()